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Original Message
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| RE: identifying a 428 |
| By Dave Shoe - 01/05/2002 7:42:32 AM; IP 216.243.158.41 |
Point the crank somewhere close to TDC. Remove the tranny inspection cover (1/2" wrench, 4 bolts) and sneak a peek at the 1/4" (or so) wide notch at the bottom of the crank at the flywheel. If there is no "huge crescent" next to the notch which has been sliced outta the crankshaft flange, then you've got at least a 390/410/428 on your hands.
To verify it's a 410/428. you gotta pull a spark plug and SOMEHOW measure the stroke. If it's closer to 3.984" than 3.784", then you've got the long crank. Good luck telling the difference!
As for the bore, there's really no way to verify it outsida pulling the heads. By now, you don't know whether sombody has overbored a 390 block or whether you've got a genni 428 block anyhow - they have identical casting indicators on the outside.
Best chance of verifying it's a 428 block is to punch out the center two core plugs and look for the number 428 cast onto the floor. If you don't find it, no problem, it may be located elsewhere or covered by sludge. Pop out the other four core plugs (engine must be out of he car) and use a drill-bit to measure the gap between all bores. If the base of a 1/4" drill bit fits between the water jackets of any of the six core plug holes, you've likely got an overbored 390 block on your hands. If the drill bit don't fit in any of the six positions, you might just have a real 428 on your hands.
Lastly, if you have access to the flywheel face of the block, look for a large "A" (std), "C" (HD), or "X"(428freak) protruding from the face. If you see one of these LARGE characters, then it's very likely a 428 block.
Not pulling the heads? It won't be easy.
JMO,
Shoe.
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